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EP0321346B1 - Threaded element, a bolt for example, and connection of different parts using this element - Google Patents

Threaded element, a bolt for example, and connection of different parts using this element Download PDF

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Publication number
EP0321346B1
EP0321346B1 EP88403195A EP88403195A EP0321346B1 EP 0321346 B1 EP0321346 B1 EP 0321346B1 EP 88403195 A EP88403195 A EP 88403195A EP 88403195 A EP88403195 A EP 88403195A EP 0321346 B1 EP0321346 B1 EP 0321346B1
Authority
EP
European Patent Office
Prior art keywords
thread
circle
arcs
threaded element
radius
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88403195A
Other languages
German (de)
French (fr)
Other versions
EP0321346A1 (en
Inventor
Jean-Claude Frèrejacques
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Simmonds SA
Original Assignee
Simmonds SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Simmonds SA filed Critical Simmonds SA
Priority to AT88403195T priority Critical patent/ATE63982T1/en
Publication of EP0321346A1 publication Critical patent/EP0321346A1/en
Application granted granted Critical
Publication of EP0321346B1 publication Critical patent/EP0321346B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/02—Shape of thread; Special thread-forms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y10T403/5746—Continuous thread

Definitions

  • the present invention essentially relates to an improved threaded element, such as for example a male threaded element forming a screw.
  • a helical thread has a bottom which may have, in section along a plane containing the axis of the threaded element, a rounded or arcuate shape tangentially joining the blanks of the thread, as appears in documents US-A-3,433,117 and US-A-4,040,327.
  • the present invention aims to remedy these drawbacks by proposing a threaded element whose bottom of the helical thread is such that the maximum stress at the bottom of the thread is considerably reduced, which makes it possible to increase the duration of use or the load of the assemblies, and which, at the same time significantly improves the security sought for them.
  • the invention relates to a threaded element, such as for example a male threaded element forming a screw, comprising at least one helical thread, the bottom of which has, in section along a plane containing the axis of the threaded element, a rounded or arcuate shape tangentially joining the blanks of the thread, characterized in that said bottom of the net, seen along the said section, comprises three arcs of circle which consist of two arcs of circle of equal radii tangentially connected to the blanks of the net and, of an arc of circle of different radius tangentially connected to the two arcs of circle of equal radii.
  • the radius of the two circular arcs of equal radii is equal to 0.095 x pitch of the thread of the threaded element, these two circular arcs each comprising a connection point to the blanks of the thread whose distance to the axis of symmetry of the threaded element is equal to 0.156 times the pitch of the thread, while the centers of these two arcs of circle of equal radii are located on a straight line perpendicular to the blank of the thread at the level of the said connection point, the radii of the two arcs of a circle being defined by the distance between their aforementioned centers and said connection point.
  • the middle circular arc tangentially connecting to the two circular arcs of above-mentioned equal radii has a center located on the axis of symmetry of the thread at a distance equal to 1.57 times the radius of the two circular arcs of equal radii, this distance being counted from the intersection of these radii with said axis of symmetry.
  • the particular shape of the bottom of the thread of the threaded element according to this invention advantageously leads to a reduction in stresses which is greater than 10%.
  • a threaded element 1 which can take, for example, the shape of a screw, and which comprises a helical thread F comprising blanks 2 to which a rounded connection 3 tangentially connects forming the bottom of the thread F.
  • the bottom 3 of the net consists of three arcs of a circle, namely two arcs of a circle 4 of equal radii tangentially connected to the blanks 2 of the net, and a mid-circle arc of different radius and tangentially connected to two arcs 4 of equal radius.
  • An optimal threading profile has therefore been produced according to the invention thanks to three arcs of a circle forming the bottom of the thread and as defined above, so as to significantly reduce the stress rate in the threaded element at the thread .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Forging (AREA)
  • Rotary Pumps (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Pens And Brushes (AREA)

Abstract

The present invention relates to an improved threaded element forming for example a screw, which comprises a thread (F) whose bottom (3) comprises two arcs of a circle (4) with equal radii (r1) which are connected tangentially with the sides (2) of thread (F) and one central arc of a circle (5) with a larger radius (r2), and which is connected tangentially with the two arcs of a circle (4).

Description

La présente invention a essentiellement pour objet un élément fileté perfectionné, tel que par exemple un élément fileté mâle formant une vis.The present invention essentially relates to an improved threaded element, such as for example a male threaded element forming a screw.

Elle vise également un assemblage de pièces quelconques, réalisé à l'aide d'un tel élément fileté.It also relates to an assembly of any parts, produced using such a threaded element.

On sait depuis longtemps qu'un filetage hélicoïdal comporte un fond qui peut présenter, en section suivant un plan contenant l'axe de l'élément fileté, une forme arrondie ou en arc de cercle se raccordant tangentiellement aux flans du filetage, comme cela apparaît dans les documents US-A-3 433 117 et US-A-4 040 327.It has long been known that a helical thread has a bottom which may have, in section along a plane containing the axis of the threaded element, a rounded or arcuate shape tangentially joining the blanks of the thread, as appears in documents US-A-3,433,117 and US-A-4,040,327.

Or, dans un assemblage réalisé à l'aide de tels éléments filetés, il se produit à la longue ou lorsque l'assemblage est sollicité par des forces extérieures, des contraintes qui se situent dans l'élément fileté au niveau du fond arrondi du filet. De telles contraintes nuisent évidemment à la sécurité de l'assemblage et peuvent même aller jusqu'à provoquer des ruptures de l'élément fileté et donc la désolidarisation des pièces assemblées.However, in an assembly made using such threaded elements, it occurs in the long run or when the assembly is stressed by external forces, stresses which are located in the threaded element at the rounded bottom of the thread . Such constraints obviously harm the safety of the assembly and can even go so far as to cause breaks in the threaded element and therefore the separation of the assembled parts.

La présente invention a pour but de remédier à ces inconvénients en proposant un élément fileté dont le fond du filetage hélicoïdal est tel que la contrainte maximum au niveau du fond du filet est considérablement réduite, ce qui permet d'augmenter la durée d'utilisation ou la charge des assemblages, et ce qui, du même coup améliore nettement la sécurité recherchée pour ceux-ci.The present invention aims to remedy these drawbacks by proposing a threaded element whose bottom of the helical thread is such that the maximum stress at the bottom of the thread is considerably reduced, which makes it possible to increase the duration of use or the load of the assemblies, and which, at the same time significantly improves the security sought for them.

A cet effet, l'invention a pour objet un élément fileté, tel que par exemple un élément fileté mâle formant vis, comprenant au moins un filet hélicoïdal dont le fond présente, en section suivant un plan contenant l'axe de l'élément fileté, une forme arrondie ou en arc de cercle se raccordant tangentiellement aux flans du filet, caractérisé en ce que ledit fond du filet, vu suivant ladite section, comporte trois arcs de cercle qui se composent de deux arcs de cercle de rayons égaux raccordés tangentiellement aux flans du filet et, d'un arc de cercle milieu de rayon différent raccordé tangentiellement aux deux arcs de cercle de rayons égaux.To this end, the invention relates to a threaded element, such as for example a male threaded element forming a screw, comprising at least one helical thread, the bottom of which has, in section along a plane containing the axis of the threaded element, a rounded or arcuate shape tangentially joining the blanks of the thread, characterized in that said bottom of the net, seen along the said section, comprises three arcs of circle which consist of two arcs of circle of equal radii tangentially connected to the blanks of the net and, of an arc of circle of different radius tangentially connected to the two arcs of circle of equal radii.

Suivant un mode de réalisation préféré de l'invention, le rayon des deux arcs de cercle de rayons égaux est égal à 0,095 x pas du filetage de l'élément fileté, ces deux arcs de cercle comportant chacun un point de raccordement aux flans du filet dont la distance à l'axe de symétrie de l'élément fileté est égale à 0,156 fois le pas du filetage, tandis que les centres de ces deux arcs de cercle de rayons égaux sont situés sur une droite perpendiculaire au flan du filet au niveau du point de raccordement précité, les rayons des deux arcs de cercle étant définis par la distance entre leurs centres précités et ledit point de raccordement.According to a preferred embodiment of the invention, the radius of the two circular arcs of equal radii is equal to 0.095 x pitch of the thread of the threaded element, these two circular arcs each comprising a connection point to the blanks of the thread whose distance to the axis of symmetry of the threaded element is equal to 0.156 times the pitch of the thread, while the centers of these two arcs of circle of equal radii are located on a straight line perpendicular to the blank of the thread at the level of the said connection point, the radii of the two arcs of a circle being defined by the distance between their aforementioned centers and said connection point.

Suivant une autre caractéristique de l'invention, l'arc de cercle milieu se raccordant tangentiellement aux deux arcs de cercle de rayons égaux précités, possède un centre situé sur l'axe de symétrie du filet à une distance égale à 1,57 fois le rayon des deux arcs de cercle de rayons égaux, cette distance étant comptée à partir de l'intersection de ces rayons avec ledit axe de symétrie.According to another characteristic of the invention, the middle circular arc tangentially connecting to the two circular arcs of above-mentioned equal radii has a center located on the axis of symmetry of the thread at a distance equal to 1.57 times the radius of the two circular arcs of equal radii, this distance being counted from the intersection of these radii with said axis of symmetry.

La forme particulière du fond du filetage de l'élément fileté selon cette invention conduit avantageusement à une réduction des contraintes qui est supérieure à 10%.The particular shape of the bottom of the thread of the threaded element according to this invention advantageously leads to a reduction in stresses which is greater than 10%.

Mais d'autres avantages et caractéristiques de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés, donnés uniquement à titre d'exemple, et dans lesquels:

  • La figure 1 est une demi-vue en coupe axiale et partielle d'un élément fileté conforme à cette invention; et
  • La figure 2 est une vue d'un filet à grande échelle et en section suivant un plan passant par l'axe de l'élément fileté.
However, other advantages and characteristics of the invention will appear better in the detailed description which follows and which refers to the appended drawings, given solely by way of example, and in which:
  • Figure 1 is a half view in axial and partial section of a threaded element according to this invention; and
  • Figure 2 is a view of a net on a large scale and in section along a plane passing through the axis of the threaded element.

En se reportant aux figures 1 et 2, on voit un élément fileté 1 qui peut revêtir par exemple la forme d'une vis, et qui comprend un filet hélicoïdal F comportant des flans 2 auxquels se raccorde tangentiellement un arrondi 3 formant le fond du filet F.Referring to Figures 1 and 2, there is shown a threaded element 1 which can take, for example, the shape of a screw, and which comprises a helical thread F comprising blanks 2 to which a rounded connection 3 tangentially connects forming the bottom of the thread F.

Conformément à l'invention, et comme on le voit mieux sur la figure 2, le fond 3 du filet est constitué par trois arcs de cercle, à savoir deux arcs de cercle 4 de rayons égaux raccordés tangentiellement aux flans 2 du filet, et un arc de cercle milieu de rayon différent et raccordé tangentiellement aux deux arcs de cercle 4 de rayons égaux.In accordance with the invention, and as best seen in FIG. 2, the bottom 3 of the net consists of three arcs of a circle, namely two arcs of a circle 4 of equal radii tangentially connected to the blanks 2 of the net, and a mid-circle arc of different radius and tangentially connected to two arcs 4 of equal radius.

On a montré en O₁ les centres des arcs de cercle 4, lesquels centres sont situés sur une droite perpendiculaire au flan 2 du filet, au niveau du point de raccordement Z des arcs de cercle 4 aux flans 2. Le rayon r₁ est donc défini par la distance O₁Z.We have shown in WHERE the centers of the arcs of circle 4, which centers are located on a straight line perpendicular to the blank 2 of the net, at the point of connection Z of the arcs of circle 4 to the blanks 2. The radius r₁ is therefore defined by the distance WHERE.

En outre, la distance D du point de raccordement Z à l'axe de symétrie X-X′ du filet sera égale à 0,156 fois le pas du filetage, le rayon r₁ des deux arcs de cercle 4 possèdant une longueur telle que r₁ = 0,095 fois le pas du filetage.In addition, the distance D from the connection point Z to the axis of symmetry XX ′ of the thread will be equal to 0.156 times the thread pitch, the radius r₁ of the two arcs of circle 4 having a length such that r₁ = 0.095 times the not thread.

On a montré en O₂ sur la figure 2 le centre de l'arc de cercle milieu 5, lequel centre est situé sur l'axe de symétrie X-X′ du filet F à une distance A telle que A = 1,57 r₁ comptée à partir de l'intersection I des deux rayons r₁ avec ledit axe de symétrie X-X′. On a repéré en r₂ sur la figure 2 le rayon de l'arc de cercle milieu 5 qui est défini par la distance O₂C.We have shown in O₂ in Figure 2 the center of the arc of a middle circle 5, which center is located on the axis of symmetry XX ′ of the thread F at a distance A such that A = 1.57 r₁ counted from of the intersection I of the two radii r₁ with the said axis of symmetry XX ′. We have identified in r₂ in Figure 2 the radius of the arc of the middle circle 5 which is defined by the distance O₂C.

On comprend donc qu'avec toutes les données ci-dessus, les arcs de cercle 4 et 5 formant le fond du filet F pourront être définis et cela pour différentes valeurs de pas.It is therefore understood that with all the above data, the arcs of circle 4 and 5 forming the bottom of the thread F can be defined and this for different values of pitch.

C'est ainsi que par exemple pour un pas de 1 mm, r₁ = 0,095 mm et r₂ = 0,301 mm.This is how, for example, for a step of 1 mm, r₁ = 0.095 mm and r₂ = 0.301 mm.

Egalement, pour un pas de 1,5 mm, r₁= 0,142 mm et r₂ = 0,451 mm.Also, for a step of 1.5 mm, r₁ = 0.142 mm and r₂ = 0.451 mm.

Grâce à cette configuration particulière à trois arcs de cercle formant le fond du filetage, on peut obtenir une diminution de 11% de la contrainte maximale dans la partie F₁ du fond de filet, dite contrainte de Von MISES.Thanks to this particular configuration with three circular arcs forming the bottom of the thread, it is possible to obtain an 11% reduction in the maximum stress in the part F₁ of the bottom of the thread, called the Von MISES stress.

On a donc réalisé suivant l'invention un profil optimal de filetage grâce à trois arcs de cercle formant le fond du filetage et tels que définis ci-dessus, de façon à réduire notablement le taux de contraintes dans l'élément fileté au niveau du filetage.An optimal threading profile has therefore been produced according to the invention thanks to three arcs of a circle forming the bottom of the thread and as defined above, so as to significantly reduce the stress rate in the threaded element at the thread .

Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple.Of course, the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example.

Claims (4)

1. Threaded element such for instance as a male threaded element forming a screw comprising at least one helical thread (F) the root (3) of which exhibits in section along a plane containing the axis of the threaded element (1) a rounded shape connecting tangentially to the flanks (2) of the thread, characterized in that the said root (3) of the thread viewed along the said section comprises three arcs of a circle (4, 5) which consist of two arcs of a circle (4) with equal radii (r₁) connecting tangentially to the flanks (2) of the thread and of a middle arc of a circle (5) with a different radius (r₂) connected tangentially to both arcs of a circle with equal radii (4).
2. Threaded element according to claim 1, characterized in that the radii (r₁) of both arcs of a circle (4) with equal radii are such that r₁ = 0.095 x thread pitch of the threaded element (1), these two arcs of a circle (4) comprising each one a point (Z) of connection to the thread flank the distance (D) of which from the axis of symmetry (X-X′) of the thread is equal to 0.156 times the thread pitch, whereas the centers (O₁) of the arcs of a circle with a radius (r₁) are lying on a straight line perpendicular to the thread flank (2) at the point of connection (Z), the said radius (r₁) being defined by the distance (O₁Z).
3. Threaded element according to claim 1 or 2, characterized in that the middle arc of a circle (5) with the radius (r₂) connecting tangentially to both arcs of a circle with a radius (r₁) has a center (O₂) located on the axis of symmetry (X-X′) of the thread at a distance A such that A = 1.57r₁ counted from the intersection (I) of both radii (r₁) with the said axis of symmetry.
4. Assembly of any parts whatsoever by means of at least one threaded element according to one of claims 1 to 3.
EP88403195A 1987-12-18 1988-12-15 Threaded element, a bolt for example, and connection of different parts using this element Expired - Lifetime EP0321346B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88403195T ATE63982T1 (en) 1987-12-18 1988-12-15 THREADED ITEM, SUCH AS A SCREW, AND CONNECTION OF PARTS USING SUCH ITEM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8717774 1987-12-18
FR8717774A FR2624931B1 (en) 1987-12-18 1987-12-18 IMPROVED THREADED ELEMENT FORMING FOR EXAMPLE A SCREW, AND ASSEMBLY OF PARTS MADE BY MEANS OF THIS ELEMENT

Publications (2)

Publication Number Publication Date
EP0321346A1 EP0321346A1 (en) 1989-06-21
EP0321346B1 true EP0321346B1 (en) 1991-05-29

Family

ID=9358069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88403195A Expired - Lifetime EP0321346B1 (en) 1987-12-18 1988-12-15 Threaded element, a bolt for example, and connection of different parts using this element

Country Status (7)

Country Link
US (1) US4861210A (en)
EP (1) EP0321346B1 (en)
AT (1) ATE63982T1 (en)
DE (1) DE3863065D1 (en)
ES (1) ES2023005B3 (en)
FR (1) FR2624931B1 (en)
GR (1) GR3002469T3 (en)

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US5056611A (en) * 1990-05-29 1991-10-15 Galloway Trust Screw thread structure
DE4342415C2 (en) * 1993-12-13 1998-04-16 Haerle Anton Tension-optimized thread profile
US5800107A (en) * 1996-04-19 1998-09-01 Giannuzzi; Louis N. Self-tapping, screw-type masonry anchor
FR2807138B1 (en) * 2000-03-31 2002-05-17 Vallourec Mannesmann Oil & Gas TUBULAR THREADED ELEMENT FOR FATIGUE-RESISTANT TUBULAR THREADED JOINT AND RESULTING TUBULAR THREADED JOINT
DE60318117T2 (en) * 2003-02-20 2008-12-11 Conti Fasteners Ag CUTTING SCREW FOR USE IN LIGHT EXPANDABLE MATERIALS
NL1024889C1 (en) * 2003-11-26 2005-05-27 Ihc Holland Nv Threaded connection in particular between a shaft and a component to be mounted thereon.
US20100018699A1 (en) * 2007-03-21 2010-01-28 Hall David R Low Stress Threadform with a Non-conic Section Curve
SE0701371L (en) * 2007-06-05 2008-03-11 Sandvik Intellectual Property Rock drilling equipment as well as female and trades therefor
DE102008047060B4 (en) * 2008-09-12 2011-05-26 Tracto-Technik Gmbh & Co. Kg threaded connection
GB2470404B (en) * 2009-05-22 2014-03-19 Phillips Screw Co Low energy screws for wood and similar materials
SG179322A1 (en) * 2010-10-01 2012-04-27 Infastech Ip Pte Ltd Threaded fastener
SE535814C2 (en) * 2011-05-20 2013-01-02 Atlas Copco Secoroc Ab Threading device, threaded joint and drill string component for striking rock drilling
JP6017944B2 (en) * 2011-12-09 2016-11-02 国立研究開発法人物質・材料研究機構 High strength bolt and manufacturing method thereof
US9404524B2 (en) * 2013-07-19 2016-08-02 Conti Fasteners High performance thread rolling screw/bolt for use in an unthreaded nut anchor
US10662722B2 (en) 2014-06-13 2020-05-26 Schlumberger Technology Corporation Threaded connections and downhole tools incorporating the same
US10145496B2 (en) * 2014-06-13 2018-12-04 Schlumberger Technology Corporation Rotary shouldered connections and thread design
US10160033B2 (en) 2014-06-23 2018-12-25 Schlumberger Technology Corporation Cold rolling devices and cold rolled rotary shouldered connection threads
US9874058B2 (en) 2014-07-31 2018-01-23 Baker Hughes, A Ge Company, Llc Fatigue resistant thread profile with combined curve rounding
US20170254352A1 (en) * 2014-11-13 2017-09-07 Essence Method Refine Co., Ltd. Fastener
US10669787B2 (en) * 2016-12-09 2020-06-02 Schlumberger Technology Corporation Pump rod connection
DE102017214625A1 (en) * 2017-08-22 2019-02-28 Robert Bosch Gmbh Spark plug with improved thread geometry
US11382724B2 (en) 2017-10-11 2022-07-12 Evollution Ip Holdings, Inc. Three-dimensional stabilization thread form for dental implants
US11204057B2 (en) * 2019-07-16 2021-12-21 Dennis Sherlin Optimized thread profile for joining composite materials
DE102019130009A1 (en) * 2019-11-07 2021-05-12 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Tool for non-cutting production or post-processing of a thread, method for producing the tool and method for producing a thread
CN112576594B (en) * 2020-12-07 2022-01-11 泰尔重工股份有限公司 Large-root fillet uniform-strength thread and machining method thereof

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Also Published As

Publication number Publication date
ATE63982T1 (en) 1991-06-15
DE3863065D1 (en) 1991-07-04
EP0321346A1 (en) 1989-06-21
US4861210A (en) 1989-08-29
FR2624931B1 (en) 1990-06-01
GR3002469T3 (en) 1992-12-30
ES2023005B3 (en) 1991-12-16
FR2624931A1 (en) 1989-06-23

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